Dental lamp.



H. A. SCHWARTZ.

DENTAL LAMP.

APPLICATION r|LED1uNE3.1915.

Patented May 2, 1916.

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` v- HARRY A. SCHWARTZ, 0F CHICAGO, ILLINOIS.

DENTAL LAMr.

specicati'on of Letters Patent.-

Patented May 2, 1916.

Application filed .Tune 3, 1915. Serial No. 31,802.

To all whom it 'may concern .i

Be it known that I, HARRY A. SorrwARTz, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certa1n new and tient.

I The objectl of my invention is to produce a construction such that the operator may f It is also my object to obtain certain reobtain a beam of reflected lightv in distinc-` tion to a. direct light, and'may readily and instantly throw the beam in the direction desired. In this connection itis my purpose to obtain a construction such that light may be used by either a right handed ory left handed operator.

Another object of the' invention is to provide a lamp having an external casing which always remains cool to thereby avoid danger or discomfort to the operator and his patient.

'Still another object, is to -provide, in connection with such a lamp, a mirror for the use of the patient, which mirror may be adjusted to practically every'conceivable position which might be necessary for itsiuse.

finements of detail which will be hereinafter more particularly noted.

I obtain my objects by the mechanism illustrated in the accompanying drawings, in which- `Figure 1 is a side elevation of the complete lamp, parts of the casing being ref 4moved 'to better reveal the construction. 40

electric lamp, the same being capable ofthrowing a strong and steady light from a comparatively small bulb. This lamp vis mounted upon any suitable socket 2 having'a switch 3. The-electric conductors may be led tothe socket if desired through a flexible tube 4. In the particular designV shown, a metallic base 5 rises from the socket 2.,- said base being of sheet metal and circular in cross-section. Surmounting the base is a y,ing

ycasing consisting, in the particular design selected yto illustrate the invention, of an outer and inner shell. outer shell consists of a lower hemispherical element 6, resting upon the annular upper mouth of the base 5 and having an inwardly projecting annular shoulder 7 for supporting the lower hemispherical portion 8f, of the inner shell. The outer and inner shells are completed by the outer and inner hemispherical portions 9 and 10 respectively. These outer and inner shells are not neces- -sarily truly spherical, but are preferably approximately spherical. The outer shell is perforate or foraminous while the inner shell is imperforate, except for the ports 11 near the bottom, as best shown in Fig. 1. These shells are open at the top., the opening being covered yby a wire screen 12. As a result of this construction lair can pass in through the walls of the outer shell and thus reduce the temperature of the inner shell and keep down the temperature of the outer shell to a point where it will not cause any discomfort to one touching it. The screen 12 at the top, serves as a protector to prevent anything from dropping onto the lamp bulb, and also cuts olf some of the' light which is 'thrown upward from4 the bulb. This reduces the glare iwhich otherwise might 'annoy the operator. vThe inner shell has an opening 15' at thefront through which the light from the lamp bulb may pass out. Opposite this opening is acollar 16 which is cylindrical and has `a horizontal aXis which passes approximately through the centerv of the lampI bulb. Fitting into this 4 collar is a lens holder 17 which vcarries an external bezel 18 for'retaining the lens 19. In this construction the rim of the lens is 'held against theannular end ofthe lens holder by the flange 20 of the bezeLthe cylindrical sides of the bezel itself surroundthe lens and thusholding` it in place. The lens holder is rotatable tudinal axis, being held in tion by the screw 21, shown in Fig. 1. The bezel is rotatable upon they lens holder, being held in any desired position by the set screws 22, 22.

VA. block 25 is pivotally mounted upon bezel 18 so as to rotate about a pin 26 eX- te'nding transversely to the focal axis of the lens. ThisA block carries a pin 27 which serves as a pivot for the block 28, which serves as a support for a concave reflector.

about its longithe desired posi- In this design the Said reflector consists, in the present instance,of a concave glass 29, backed up by va metallic backing 30, as best shown in Fig.

3. The pin 27 extends transversely to pin 26 and the result is that the mirror 29, 30 may be moved to various positions-infact the parts 25, 26, 27 and 28 constitute What may be termed a universal joint.

A mirror 32 is fastened to a rod 33 Which is both slidable and rotatable in an arm 34 .throws a beam of light through the lens 19, Which lens,- in thepreferred construction, isa double convex lens and tends to focus the light. The focal axis is indicated by the brokenline a, F ig.3. -Ifthe reflector 29, 30 is brought to the position shown in dotted lines in Fig. 3, the beam Will be reflected in general along the broken line Z), Fig. 3.4 As the reflector is concave, it Will tend to concentrate the beam-of flightfso that under ordinary conditions it Will be concentrated to a-comparatively small'area at that point in the mouth or throat Where the operator is Working. In other Words, the illuminated area or field Willbe comparatively small, the intensity .of light Will be correspondingly great. The amount of concentration, however, may be varied by varying the shape of the lens or the concavity of the reflector during the manufacture of the appliance. As the reflector' is hinged upon a universal joint .it is possible to throw the beam in almost any-direction or to throw therefiector back out of the path of the beam as indicated in full lines in Figs. l, 2 and 3'. In case the operator is left handed or occasion may arise, for any other reason, the position of 'the reflector may be reversed by rotating the bezel 18 upon the lens holder 17. By rotating the bezel 180o the reflector hinge Will occupy a position on the opposite side of the lens.v It vvill thus bemanifest that the reflector may be brought to practically any position desired, and the appliance may be used for a variety of purposes. If the mirror 32 is not Wanted, the stem 37 may be lifted out of the socket 38 and the entire mirror and its supporting arms taken away.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

l. A dental lamp having a casing provided with an inner and an outer sheet metal shell lapproximately spherical in form and concentric, the o-uter shell having inlet openings in the side, said shells having concentric openings at the top for the escape of heat, and a screen over said openings for the purpose described.

2. In a dental lamp, the combination of a lamp casing having an opening in the side, a. lens holder coaxial with said opening, a

lens, a bezel for holding said lens in position in the holder, said bezel being rotatable upon' the holderabout the aXis of said holder, a concave-reflector, and a universal hinge joint by which said reflector is secured to said bezel.

3. In a dental lamp, the combination of a lamp casing having an opening in the side,

scribed my name.

HARRY A. SCHWARTZ. 

